Sounds way too hight to me. Check out the prices from Partzilla, items 7 & 18. Although this parts list is for a 1977, it's the same part for K0 - 78.
As CJ pointed out, I don't like the OEM gasket either. It traps moisture and rusts out the pipe within a couple of years. I agree with OLDCT, and use heat wrap as well. I have more than I'll ever use. If you're in the US, will gladly send you more than you need for $6 delivered.
Just shoot me a PM if interested.